After their friend who has been missing for more than three years turns up dead, four former best friends continue to receive frightening messages from someone who knows damaging secrets about them.

Emily, Aria, Hanna, and Spencer continue to live in fear as they struggle to keep hidden even more secrets and someone new begins stalking them via their cell phones.

#1 New York Times bestselling series The second book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. In ultra-exclusive Rosewood, Pennsylvania, four beautiful girls are hiding very ugly secrets. Spencer covets her sister's boyfriend. Aria is fantasizing about her gorgeous young English teacher. Emily is infatuated with the new girl at school. And Hanna is using some ugly tricks to stay amazingly...

#1 New York Times bestselling series The fourth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars.Four pretty little liars' charmed lives have turned into living nightmares. Emily's been shipped off to Iowa to live with her überconservative cousins. Aria's boyfriend is behind bars-because of her. Spencer's afraid she was involved in Ali's murder. But Hanna's fate is far worse: She's clinging...

Forgetting the lessons they should have learned after being stalked by "A," Hanna, Spencer, Emily, and Aria-- high school juniors in Rosewood, Pennsylvania--return to their wicked, deceitful ways, but this time the consequences will be deadly.

#1 New York Times bestselling series The eighth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. Hanna, Aria, Spencer, and Emily have been through a lot together-childhood pranks gone horribly wrong, not one, but two stalkers-blackmailers who know all their dirty secrets, not to mention their best friend's murder investigation. Now these pretty little liars are finally going to uncover...

#1 New York Times bestselling series The tenth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. Four little liars are at it again. Aria's love life is on the Fitz-ahem, fritz. Emily's exploring her wild side. Hanna's kissing the enemy. And someone from Spencer's past-someone she never thought she'd see again-is back to haunt her. But none of that compares to what these pretty little liars...

Rule number one of being an effective stalker: get to know your prey, the trouble they get into, the messes they make, and the secrets they keep. Hanna's desperate for a very personal session with her gym trainer. Emily is number one on Santa's naughty list. Aria's old flame from Iceland is about to land her in hot water. And Spencer's resorting to some backhanded tactics to get what she wants.

Struggling to return to normalcy after surviving Alison's attempt to kill them, Spencer, Aria, Emily and Hanna endure a series of disasters before realizing that they are being stalked by a new "A" who knows all of their secrets.

"It's springtime in Rosewood, but while everyone else is searching for the perfect prom dress, Hanna, Spencer, Emily, and Aria are on a different kind of hunt: They're looking for A...Hanna puts her campaign for prom queen on the back burner to volunteer at a burn clinic, where one of A's victims is recovering. Emily digs into Ali's past at the mental hospital with some very crazy consequences. Spencer contacts an amateur private eye to help her stalk...